gpioc.c revision 213277 
1/*-
2 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/dev/gpio/gpioc.c 213277 2010-09-29 20:53:33Z gonzo $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/types.h>
33
34#include <sys/bus.h>
35#include <sys/conf.h>
36#include <sys/ioccom.h>
37#include <sys/kernel.h>
38#include <sys/malloc.h>
39#include <sys/module.h>
40#include <sys/queue.h>
41#include <machine/bus.h>
42#include <machine/resource.h>
43
44#include <sys/gpio.h>
45#include "gpio_if.h"
46
47#undef GPIOC_DEBUG
48#ifdef GPIOC_DEBUG
49#define dprintf printf
50#else
51#define dprintf(x, arg...)
52#endif
53
54static int gpioc_probe(device_t dev);
55static int gpioc_attach(device_t dev);
56static int gpioc_detach(device_t dev);
57
58static d_ioctl_t	gpioc_ioctl;
59
60static struct cdevsw gpioc_cdevsw = {
61	.d_version	= D_VERSION,
62	.d_ioctl	= gpioc_ioctl,
63	.d_name		= "gpioc",
64#if __FreeBSD_version >= 800039
65	.d_flags	= D_PSEUDO | D_NEEDMINOR
66#endif
67};
68
69struct gpioc_softc {
70	device_t	sc_dev;		/* gpiocX dev */
71	device_t	sc_pdev;	/* gpioX dev */
72	struct cdev	*sc_ctl_dev;	/* controller device */
73	int		sc_unit;
74};
75
76static int
77gpioc_probe(device_t dev)
78{
79	device_set_desc(dev, "GPIO controller");
80	return (0);
81}
82
83static int
84gpioc_attach(device_t dev)
85{
86	struct gpioc_softc *sc = device_get_softc(dev);
87
88	sc->sc_dev = dev;
89	sc->sc_pdev = device_get_parent(dev);
90	sc->sc_unit = device_get_unit(dev);
91	sc->sc_ctl_dev = make_dev(&gpioc_cdevsw, sc->sc_unit,
92	    UID_ROOT, GID_WHEEL, 0600, "gpioc%d", sc->sc_unit);
93	if (!sc->sc_ctl_dev) {
94		printf("Failed to create gpioc%d", sc->sc_unit);
95		return (ENXIO);
96	}
97	sc->sc_ctl_dev->si_drv1 = sc;
98
99	return (0);
100}
101
102static int
103gpioc_detach(device_t dev)
104{
105	struct gpioc_softc *sc = device_get_softc(dev);
106	int err;
107
108	if (sc->sc_ctl_dev);
109		destroy_dev(sc->sc_ctl_dev);
110
111	if ((err = bus_generic_detach(dev)) != 0)
112		return (err);
113
114	return (0);
115}
116
117static int
118gpioc_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int fflag,
119    struct thread *td)
120{
121	int max_pin, res;
122	struct gpioc_softc *sc = cdev->si_drv1;
123	struct gpio_pin pin;
124	struct gpio_req req;
125
126	switch (cmd) {
127		case GPIOMAXPIN:
128			max_pin = -1;
129			res = GPIO_PIN_MAX(sc->sc_pdev, &max_pin);
130			bcopy(&max_pin, arg, sizeof(max_pin));
131			break;
132		case GPIOGETCONFIG:
133			bcopy(arg, &pin, sizeof(pin));
134			dprintf("get config pin %d\n", pin.gp_pin);
135			res = GPIO_PIN_GETFLAGS(sc->sc_pdev, pin.gp_pin,
136			    &pin.gp_flags);
137			/* Fail early */
138			if (res)
139				break;
140			GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &pin.gp_caps);
141			GPIO_PIN_GETNAME(sc->sc_pdev, pin.gp_pin, pin.gp_name);
142			bcopy(&pin, arg, sizeof(pin));
143			break;
144		case GPIOSETCONFIG:
145			bcopy(arg, &pin, sizeof(pin));
146			dprintf("set config pin %d\n", pin.gp_pin);
147			res = GPIO_PIN_SETFLAGS(sc->sc_pdev, pin.gp_pin,
148			    pin.gp_flags);
149			break;
150		case GPIOGET:
151			bcopy(arg, &req, sizeof(req));
152			res = GPIO_PIN_GET(sc->sc_pdev, req.gp_pin,
153			    &req.gp_value);
154			dprintf("read pin %d -> %d\n",
155			    req.gp_pin, req.gp_value);
156			bcopy(&req, arg, sizeof(req));
157			break;
158		case GPIOSET:
159			bcopy(arg, &req, sizeof(req));
160			res = GPIO_PIN_SET(sc->sc_pdev, req.gp_pin,
161			    req.gp_value);
162			dprintf("write pin %d -> %d\n",
163			    req.gp_pin, req.gp_value);
164			break;
165		case GPIOTOGGLE:
166			bcopy(arg, &req, sizeof(req));
167			dprintf("toggle pin %d\n",
168			    req.gp_pin);
169			res = GPIO_PIN_TOGGLE(sc->sc_pdev, req.gp_pin);
170			break;
171		default:
172			return (ENOTTY);
173			break;
174	}
175
176	return (res);
177}
178
179static device_method_t gpioc_methods[] = {
180	/* Device interface */
181	DEVMETHOD(device_probe,		gpioc_probe),
182	DEVMETHOD(device_attach,	gpioc_attach),
183	DEVMETHOD(device_detach,	gpioc_detach),
184	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
185	DEVMETHOD(device_suspend,	bus_generic_suspend),
186	DEVMETHOD(device_resume,	bus_generic_resume),
187
188	{ 0, 0 }
189};
190
191static driver_t gpioc_driver = {
192	"gpioc",
193	gpioc_methods,
194	sizeof(struct gpioc_softc)
195};
196
197devclass_t	gpioc_devclass;
198
199DRIVER_MODULE(gpioc, gpio, gpioc_driver, gpioc_devclass, 0, 0);
200MODULE_VERSION(gpioc, 1);
201